Slow progress on the rudder today. Riveted the counterweight rib, and the other ribs to the spar along with the rudder horn. But numerous changes to the plans caused some out of order work, while I wait for new parts to arrive that were not part of the original plans. (Specirically to hold the weight in, and rivet length changes at the rudder horn. Supervising Eileen working on her light box project at the same time also tended to slow progress.